Balances for wood windows

A quick learner from USA says:
I need to get 20 balances--I think 500 series but am concerned how to attach to sashes --this photo will show what is there now.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. I agree, we've been using our Series 500 to replace this kind of balance for a generation. To attach it to the sash, you would remove your current bottom bracket with our 17-007, which you would then mount in its place. The Series 500 will clip into this just like your old balance.
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